Pros and Cons of Plants.

Pros Blast cones This can make counterjungling less likely to be lethal It gives a prepared team better options Honeyfruit It gives people in oppressive lanes a heal It gives jungle resource bar without needing blue buff Scryer's bloom It can be used like the old Raptor buff You can use it to check your jungle for enemies Cons Blast cones Plants are RNG This can make counterjungling MORE likely to be lethal It can make easy punishes very hard It can make an unprepared team lose all options It can be used for trolling purposes very easily HoneyFruit Plants are RNG It gives oppressive laners a heal It gives counter junglers a heal It is out of reach for characters under the effects of counter jungling Scryer's bloom Plants are RNG It gives the enemy an easy full jungle check, including wards It Removes the stealthy nature of the jungle by covering such a wide area It is out of reach for people under the effects of counter jungling

Conclusion Plants are not entirely bad, but there is a lot of bad to do with them.

Things that could be done to fix the bad would be to change a few important things. notably making plants spawn in specific locations on timers, putting scryers in the middle of river where it won't catch the whole enemy jungle and elsewhere so you can use it to flush out counter junglers, make blast cone only effect the target hitting it rather than all targets within range, and either have honeyfruit removed or have greatly reduced healing effect on laners.